The simplest wildcats are those made from just fireforming standard cartridges in improved chambers. .223 AI and .22-250 AI are a good place to begin.
Those made by necking down standard cartridges are quite easy as well. 6x.284 is a great one.
Those made by necking up something standard and/or moving the shoulder get a little more complicated.
Those that involve shortening a case often require neck reaming because the thicker body of the old case becomes the neck of the new case.
If you want to try it out without having to be stuck with a gun you have no other way to feed, try making .22-250 cases from factory '06 or .308. You'll have to go through all the steps and see if it seems worthwhile, yet you can go buy factory ammo when/if you decide it was too much pain for too little gain.
Tom
